/**
 * 
 */
package com.malljelly.study.validate.code;

import com.malljelly.study.properties.SecurityProperties;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.social.connect.web.HttpSessionSessionStrategy;
import org.springframework.social.connect.web.SessionStrategy;
import org.springframework.web.bind.ServletRequestUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.context.request.ServletWebRequest;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

/**
 * @author zhailiang
 *
 */
@RestController
public class ValidateCodeController {

	public static  final String SESSION_KEY="SESSION_KEY_IMAGE_CODE";

	private SessionStrategy sessionStrategy=new HttpSessionSessionStrategy();

	@Autowired
	private SecurityProperties securityProperties;

	/**
	 * 创建验证码
	 * 
	 * @param request
	 * @param response
	 * @param type
	 * @throws Exception
	 */
	@GetMapping("/code/image")
	public void createCode(HttpServletRequest request, HttpServletResponse response) throws IOException {
		ImageCode imageCode=createImageCode(new ServletWebRequest(request));
		//验证码放入session中
		sessionStrategy.setAttribute(new ServletWebRequest(request),SESSION_KEY,imageCode);
				 ImageIO.write(imageCode.getImage(),"JPEG",response.getOutputStream());
	}

	private ImageCode createImageCode(ServletWebRequest request) {
		int width = ServletRequestUtils.getIntParameter(request.getRequest(),"width",securityProperties.getValidateCodeProperties().getImage().getWidth());
		int height =ServletRequestUtils.getIntParameter(request.getRequest(),"height",securityProperties.getValidateCodeProperties().getImage().getHeight());
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

		Graphics g = image.getGraphics();

		Random random = new Random();

		g.setColor(getRandColor(200, 250));
		g.fillRect(0, 0, width, height);
		g.setFont(new Font("Times New Roman", Font.ITALIC, 20));
		g.setColor(getRandColor(160, 200));
		for (int i = 0; i < 155; i++) {
			int x = random.nextInt(width);
			int y = random.nextInt(height);
			int xl = random.nextInt(12);
			int yl = random.nextInt(12);
			g.drawLine(x, y, x + xl, y + yl);
		}

		String sRand = "";
		for (int i = 0; i <securityProperties.getValidateCodeProperties().getImage().getLength(); i++) {
			String rand = String.valueOf(random.nextInt(10));
			sRand += rand;
			g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
			g.drawString(rand, 13 * i + 6, 16);
		}

		g.dispose();

		return new ImageCode(image, sRand, securityProperties.getValidateCodeProperties().getImage().getExpireIn());
	}


	/**
	 * 生成随机背景条纹
	 *
	 * @param fc
	 * @param bc
	 * @return
	 */
	private Color getRandColor(int fc, int bc) {
		Random random = new Random();
		if (fc > 255) {
			fc = 255;
		}
		if (bc > 255) {
			bc = 255;
		}
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}


}
